Mold-finishing machine



Dec. 19, 1922. 1,439,354

- T A, BRAGG.

3 SHEETS-SHEET l MOLD F|N| sm NG MACHINE Fuso oEc. 24. ISI 9 Dec. 19,1922. 1,439,354

T. A. BRAGG, MOLD FINISHING MACHINE.

FILED oec, 24. 1919. 3 SHEETS-SHEET 2 INVENTOR Dec. 19, 1922. 1,439,354

T. A, BRAGG. MOLD Fnmsf-HNG MACHINE.

Fuso mac 24. 1919. 3 SHEETS-SHEET 3 l 34 36 T I 5 I i Patented Dec. 19,1922.

UNITED STATES PATENT OFFICE.

THOMAS A. BRAGG, OF TOLEDO, OHIO, ASSIGNOR TO THE OWENS BOTTLE COMPANY,.OF TOLEDO, OHIO, A. CORPORATION OF OHIO.

MOLD-FINISHING MACHINE.

Application led December 24, 1919. Serial No. 347,244.

To all whom it may concewi:

Be it known that I, THOMAS A. BRAGG, a citizen of the United States,residing at Toledo, in the county of Lucas and State of jOhio, haveinvented new and useful lmprovements in Mold-Finishing Machines, of

which the followino` is a specification.

My invention re ates to improvements in machines for cuttino' orengraving molds or dies or for re-producing in cameo or intaglio and isherein shown applied to a machine ofthe general type disclosed in thepatent to Keller and VVarman, 956,769.

An object of the invention is to provide a novel form of clamping deviceby which the pattern and the molds or dies may be quickly and securelyclamped in osition on the machine. Another feature re ates to the meansfor supporting the molds in position on the work tables. A furtherfeature of the invention consists in the provision of suitable means foroscillating the work table about a vertical axis so that when cutting orengraving a curved surface, as for example, the inner concave surface ofa mold, said surface may be maintained approximately perpendicular tothe cutting too Other features of the invention will appear hereinafter.

In the accompanying drawings:

Figure 1 is an elevation of a machine to which my invention is applied.

Figure 2 is a sectional plan showing particularly the mounting 'of theWork frame for oscillating movement about a vertical axls.

Figure 3 is a plan of the machine.

Figure 4 is a detail showing means permitting a horizontal adjustment ofthe Work supporting frame. j

Figure 5 is a fragmentary elevation showing a mold or die and the meansby which it is clamped in position on the work table.

Figure 6 is a detail showing the pivotal mounting of a lever throughwhich motion. is transmitted to the swinging Work carrying frame.

Figure 7 shows a bearing plate for a Work holding clamp.

Figure 8 is a View of the clamp. l

Figure 9 is a view of a late for positionf ing a mold on the work ta le.

Figure 10 is a view similar to Figure 5,

showin a templet clamped on the work carrymg rame. u yFi re 11 is asection of the same, showing t e arrangement for adjustahly clampinfrthe templet in its holder.

1igure 12 is a perspectiveview of the temp e Figure .13 is a detailshowing a cutter and a work piece arranged at an angle thereto.

Figure 14 is a view similar to Figure 3, but with the parts in adifferent position. i

The machine comprises a stationary frame A includingr a standard l5 anda horizontally disposed portion 16 (Fig. 14).v A work carrying frame Bcomprises a vertical hack plate 17, work holding tables 18 projectingforwardly therefrom and vertical parallel bars 19 attached to the frontends of the Work tables. The work frame B is adjustahly mounted on avertically disposed supporting frame D. One or more guide bars 20(Fig. 1) attached to the rear face of the plate 17 and e-Xtendintransversely thereof, tit in correspondingly shaped grooves in the frameD, thereby permitting lateral adjustment of the work frame B foradjusting the work thereon ,to the cutter. The work frame is held inadjusted position by means of a locking pin QQ extended through anopening in the plate 17 and into one of a series of openings 23 in theplate D. Said locking` pin is carried by a hand operated lever 2-1mounted on the work frame.

The frames B and D are moved up and down by meansof a vertical drivingshaft Q5 having a screw threaded connection with rearwardly projectingarms E26 (Fig. t2) on the frame.D. The shaft x25 may he driven by anelectric motor connected thereto through speed changing gearing and are` versinU clutch contained within a casing 27. Said cliutchrandgearing may be of standard construction such as shown. for example, inl. S. Patent 1.358.929. granted to me on No vemher 16, 1920. Thereversing clutch is actuated by a lever '28 to which is attached avertical rod E29 having thereon adjustahle lugs 30 and 3l. As the workframe moves upward a tappet 32- thereon engages thn 'lu-' 1 30 andraises the rod :29, thereby shift ing die clutch and reversing thedirection of ruation of the shaft Q5. The work frame then travelsdownward until the tappet engages iso the lug 31 and again shifts theclutch and reverses the direction of feed.

Work pieces 33, here shown as hollow mold sections, are mounted on upperand lower mold tables 18. A pattern or templet 34 having a concavesurface 35, to the shape of which the mold cavities are to be cut, 1smounted on an intermediate table 18. The templetis adjustably mounted ina supporting block 36. Adjusting screws 37 permit a nice adjustment ofthe templet in a forward or rearward direction. It is also adjustable upand down and locked in adjusted position by set screws 38. Plates 40 arer e movably mounted on the tables .18, said plates being cut away toform semi-circular or other shaped recesses to recelve the work piecesand hold them in position. These plates are interchangeable and may bemade of various forms corresponding to different shaped work pieces. u

A clamping device .is provided for each die and templet, said devicecomprising a b-.ir or bracket 41 having a central threaded opening inwhich is an adjustable screw rod 42. the outer end of which is adaptedto bear against the templet or die. The latter may be provided with alug 43 or other bearing surface for the end of the rod 42. Studs 44 and45 are adjustably mounted in the ends of the bar 41 and have their outerends rounded to forni ball bearing surfaces.

When the clamp is in position these lugs.

engage in recesses 46 formed in a plate 47 attached to the plate 17. Thestud has a threaded connection with the bar 41 and is adjusted thereinbefore the clamp'is placed in position. After the clamp is placed on themachine it is tightened up by means of a hand screw 48 connected to thestud 44 for forcing the latter rearwardly. It will be seen that withthis construction all that is necessary to clamp the Work piece inposition is to place the clamp behind the work piece and tighten it upby turning the'handle 48. The clamp is arranged with the rod 42 in adownwardly and forwardl inclined po sition so that the work piece 1sheld firmly in its forward position and also held solidly down on thetable 18. Y

Rotary cutters 50 for operating on the work are carried on a frame v51mounted to swing about a vertical axis 52 for moving the cutters towardand from the work. These cutters and the tracing tool are rotated asusual by a motor 53 having suitable driving connections with thespindles on which said cutters and tool are mounted. The swinging frame51 is car led on a frame 54 mounted for transverse sliv ing movement onthe frame A for feeding the cutters across the Work pieces. Thismovement of the frame 54 is effected by any suitable mechanism, as forexample, that shown in the patent to Keller above referred to. A rack 55and pinion 56 permit hand adjustment `of the frame 54. The path of thecutters as the work frame moves up and down, is controlled as usual by astylus traveling in Contact with the pattern 35.

The templet 34 is preferably made of hardened cast iron instead of theusual bronze or steel telnplet. The block of iron for forming thetemplet or model is first cast, then surface finished, then hardened andwhere necessary further finished to correct any defects due to warpingwhile being hardened. The use of hardened cast iron is of value becauseit resists the wear of the tracing tool. Ordinary cast iron will notstand the wear of the continuously rotating tool which bears withconsiderable pressure against it. The use of bronze which has heretoforebeen commonly employed is objectionable on account of the diiiiculty andexpense of shaping and finishing it. A similar difficulty arises in theuse of steel. The l cast iron models can be made with comparative easeand are found to be highly satisfactory, owing to their great resistanceto wear.

In order that the cuttersmay at all times be substantially perpendicularto the cutting surface along which they are working, l. provideautomatic means for swinging the work table about a vertical axis insynchronism with the movements of the 4frame 54.`

For this purpose the frames B and D (Fi 2) are connected to swing with aframe horizontally about the shaft 25 as an axis. The frame E isprovided with a rearwardly extending arm 57 connected through a link 58with a lever 59. Said lever is mounted to swing about a fulcrum pin 60mounted in an arm 61 on the frame A. The lever is adjustable by means ofa longitudinal slot 62 therein through which the fulcrum pin extends,the lever being held in its adjusted position by a set screw 63 (Fig. 6)which clamps the lever in a pivot block 64 jour nailed on the pin 60.The lever 59 is connected through a linkV 65 to the frame 54. W'hentheframe 54 is moved to the left as shown in Figure 14, the work frameis swung to the left as shown, whereby the surface on which the cutter50 is operating is kept substantially perpendicular to the cutter (seeFig. 13). In like manner as the frame 54 travels to the right the workframe also swings to the right and its angular position changes so thatthe work surface remains about perpendicular to the cutter at the pointat which the cutter is operating. The extent of this angular movement ofthe work may be adjusted by adjusting the lever 59 to vary its fulcrumpoint. Thls ad# justment is such that the horizontal movement of thework piece is less than that of the cutters so that the movement of theframe 54 will feed the cutting tools across the work surfaces.

Modifications may be resorted to Within the spirit and scope of myinvention.

What I claim is:

1. The combination of a work frame comprising horizontally disposed workholding tables arranged one above another and verlo tically disposedfront and rear frame memand the said rear frame member while the workpieces are in said position. said clamps arranged to apply a' forwardand downward 'pressure to the work pieces.

2. The combination of a work frame comprising horizontally disposed workholding tables and verticalljtv disposed front and rear frame members.said tables forming supports for work pieces Iarried thereon in positionto bear against said front frame member` clamps interposed between thework pieces and the rear frame melnber while the work pieces are in saidposition. said clamps each comprising a transverse bar.` studsprojecting rearwardly from said bar to bear against the rear framemember. and an intermediate clamping l'od projecting forwardly anddownwardly from said bar to bear against the rear face of a work piece.

3. The combination of a work frame comprising horizontally disposed workholding tables and vertically disposed front and rear frame members.said tables forming supports for work pieces carried thereon in positionto bear against said front frame member,

40 clamps interposed between the work pieces and the rear frame memberwhile the work pieces are in said position. said clamps each comprisinga transverse bar. studs projecting rearwardly from said bar. and bearingplates interposed between said rear frame member `and said studs` thebearing plates being formed with concave bearing surfaces for saidstuds. one of said studs having a screw threaded connection with theclamp bar.

4. The combination with a frame to hold a templet or work piece having aconcave surface. a tool holding frame. a tool carried thereby arrangedto bear against. said concave surface. means to move said tool holdingframe and tool transiersely of said surface. and mechanical connectionsbetween said frames through which movement is transmitted from the toolholding fratrie to the work holding frame and an angular movementthereby imparted to the work holding frame as llictool is movedtransversely of said surlaic io thereby change the angle of the frame tothe tool.

5. The combination of a work holding frame to support a work piecehaving a concave surface. a cutting tool, a frame carrying said tool andarranged to hold the latter against said surface substantiallyperpendicular thereto. means to move the tool carrying frame and therebyfeed said tool across said surface and mechanical connections betweensaid frames through which the movement of the tool carrying frame istransmitted to the work frame and operates to so change the angularposition of the work frame that the cutter is kept substantiallyperpendicular to the surface at` the p oint of contact therewith.

6. The combination ot' a work frame arranged to support a work piecehaving a concave surface` of a tool holding frame. a tool carriedthereby and arranged to bear against said surface with the toolsubstantially perpendicular to said surface at its point of contact.means to feed said tool holding frame transversely to the work frame.and connections between said frames through which the tool holding frameoperates to swing the work frame as the tool advances and thereby changethe angular position ot' said concave surface so that the tool remainsapproximately perpendicular to the surface at the point of Contacttherewith.

7. The combination of a work holding frame, a tool holding frame. acarriage on which the tool holding frame is mounted. said carriagemounted to travel horizontally, said work holding frame mounted foroscillatiug movement about a vertical axis. and link and leverconnections between the work holding frame and said carriage foroscillating the work holding frame as the carriage reciprocates.

8. The combination of a work holding frame. a tool holding frame. acarriage on which the tool holding frame is mounted. said carriagemounted to travel horizontally` said tool holding frame mounted foroscil lating movement about a vertical axis. a lever, links connectingopposite ends ot' said lever to the carriage and work frame respectively for oscillating said work frame when the carriage reciprocates.and means for adjusting the fulcrum point of said lover to thereby varythe relative movement of the carriage and said frame.

9. The combination of a work holding frame. a tool holding frame. acarriage on which the tool holding frame is mounted` said carriagemounted to travel horizontally. said tool holding frame mounted foroscillating movement about a vertical axis. a lever. and linksconnecting opposite ends of said lever to the carriage and work framerespectively for oscillating said work frame when the carriagereciprocates.

Signed at Toledo. in the count)` of Lucas and State of hio. this 5 dayof December. 1919.

THOMAS A. BRAGG.

